From the MS Trust website itself - I guess you need to go book yourself in for some vaccinations if you haven't had any because you seem to be due a few from their information
"In the past there has been concern over the potential effect of vaccinations on people with multiple sclerosis. Research has failed to find evidence to support these concerns.
A study in France published in 2001 compared the relapse history of 643 people with MS with their vaccinations against tetanus, hepatitis B or influenza. The study found no evidence that vaccination increased the short-term risk of a relapse.
In 2011, Argentinian researchers found that the risk of developing MS remained unchanged after vaccinations for BCG, hepatitis B, influenza, MMR, polio and typhoid fever. Their results suggested that diphtheria and tetanus vaccination may be associated with a decreased risk of MS.
A separate study by the same team, which involved only seven people, found that the yellow fever vaccine significantly increased the relapse risk.
A study published in 2014 found no association between the hepatitis B or human papillomavirus (HPV) vaccines and an increased risk of multiple sclerosis up to three years after vaccination.
There are a few exceptionally rare complications of the vaccinations themselves but the risk of these occurring are the same for people with MS as in the general population. There is strong evidence for infections increasing the risk of a relapse.
Exceptions
People who are unwell eg experiencing a debilitating relapse may be advised to defer vaccination. This is because it will be difficult to tell the difference between the symptoms of the relapse or other illness and a bad reaction to the vaccine.
People on therapies that suppress the immune system, such as mitoxantrone, azathioprine, methotrexate, cyclophosphamide or steroids should not receive 'live' vaccines as they may be at greater risk for developing the disease. Make sure that your doctor is aware of all the medications you are taking."